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NFS: Ensure that the read code cleans up properly when rpc_run_task() fails

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In the case of readpage() we need to ensure that the pages get unlocked,
and that the error is flagged.

In the case of O_DIRECT, we need to ensure that the pages are all released.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2008-04-15 16:33:58 -04:00
parent 73e3302f60
commit fdd1e74c89
2 changed files with 46 additions and 26 deletions
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19
fs/nfs/direct.c
View file

@ -229,14 +229,20 @@ static void nfs_direct_complete(struct nfs_direct_req *dreq)
static void nfs_direct_read_result(struct rpc_task *task, void *calldata)
{
struct nfs_read_data *data = calldata;
struct nfs_direct_req *dreq = (struct nfs_direct_req *) data->req;
if (nfs_readpage_result(task, data) != 0)
return;
nfs_readpage_result(task, data);
}
static void nfs_direct_read_release(void *calldata)
{
struct nfs_read_data *data = calldata;
struct nfs_direct_req *dreq = (struct nfs_direct_req *) data->req;
int status = data->task.tk_status;
spin_lock(&dreq->lock);
if (unlikely(task->tk_status < 0)) {
dreq->error = task->tk_status;
if (unlikely(status < 0)) {
dreq->error = status;
spin_unlock(&dreq->lock);
} else {
dreq->count += data->res.count;
@ -249,11 +255,12 @@ static void nfs_direct_read_result(struct rpc_task *task, void *calldata)
if (put_dreq(dreq))
nfs_direct_complete(dreq);
nfs_readdata_release(calldata);
}
static const struct rpc_call_ops nfs_read_direct_ops = {
.rpc_call_done = nfs_direct_read_result,
.rpc_release = nfs_readdata_release,
.rpc_release = nfs_direct_read_release,
};
/*

53
fs/nfs/read.c
View file

@ -338,26 +338,25 @@ int nfs_readpage_result(struct rpc_task *task, struct nfs_read_data *data)
return 0;
}
static int nfs_readpage_retry(struct rpc_task *task, struct nfs_read_data *data)
static void nfs_readpage_retry(struct rpc_task *task, struct nfs_read_data *data)
{
struct nfs_readargs *argp = &data->args;
struct nfs_readres *resp = &data->res;
if (resp->eof || resp->count == argp->count)
return 0;
return;
/* This is a short read! */
nfs_inc_stats(data->inode, NFSIOS_SHORTREAD);
/* Has the server at least made some progress? */
if (resp->count == 0)
return 0;
return;
/* Yes, so retry the read at the end of the data */
argp->offset += resp->count;
argp->pgbase += resp->count;
argp->count -= resp->count;
rpc_restart_call(task);
return -EAGAIN;
}
/*
@ -366,29 +365,37 @@ static int nfs_readpage_retry(struct rpc_task *task, struct nfs_read_data *data)
static void nfs_readpage_result_partial(struct rpc_task *task, void *calldata)
{
struct nfs_read_data *data = calldata;
struct nfs_page *req = data->req;
struct page *page = req->wb_page;
if (nfs_readpage_result(task, data) != 0)
return;
if (task->tk_status < 0)
return;
if (likely(task->tk_status >= 0)) {
nfs_readpage_truncate_uninitialised_page(data);
if (nfs_readpage_retry(task, data) != 0)
return;
}
if (unlikely(task->tk_status < 0))
nfs_readpage_truncate_uninitialised_page(data);
nfs_readpage_retry(task, data);
}
static void nfs_readpage_release_partial(void *calldata)
{
struct nfs_read_data *data = calldata;
struct nfs_page *req = data->req;
struct page *page = req->wb_page;
int status = data->task.tk_status;
if (status < 0)
SetPageError(page);
if (atomic_dec_and_test(&req->wb_complete)) {
if (!PageError(page))
SetPageUptodate(page);
nfs_readpage_release(req);
}
nfs_readdata_release(calldata);
}
static const struct rpc_call_ops nfs_read_partial_ops = {
.rpc_call_done = nfs_readpage_result_partial,
.rpc_release = nfs_readdata_release,
.rpc_release = nfs_readpage_release_partial,
};
static void nfs_readpage_set_pages_uptodate(struct nfs_read_data *data)
@ -423,29 +430,35 @@ static void nfs_readpage_result_full(struct rpc_task *task, void *calldata)
if (nfs_readpage_result(task, data) != 0)
return;
if (task->tk_status < 0)
return;
/*
* Note: nfs_readpage_retry may change the values of
* data->args. In the multi-page case, we therefore need
* to ensure that we call nfs_readpage_set_pages_uptodate()
* first.
*/
if (likely(task->tk_status >= 0)) {
nfs_readpage_truncate_uninitialised_page(data);
nfs_readpage_set_pages_uptodate(data);
if (nfs_readpage_retry(task, data) != 0)
return;
}
nfs_readpage_truncate_uninitialised_page(data);
nfs_readpage_set_pages_uptodate(data);
nfs_readpage_retry(task, data);
}
static void nfs_readpage_release_full(void *calldata)
{
struct nfs_read_data *data = calldata;
while (!list_empty(&data->pages)) {
struct nfs_page *req = nfs_list_entry(data->pages.next);
nfs_list_remove_request(req);
nfs_readpage_release(req);
}
nfs_readdata_release(calldata);
}
static const struct rpc_call_ops nfs_read_full_ops = {
.rpc_call_done = nfs_readpage_result_full,
.rpc_release = nfs_readdata_release,
.rpc_release = nfs_readpage_release_full,
};
/*